逆向思维是与顺向思维相对而言的.在分析、解答问题时,顺向思维是按照条件出现的先后顺序进行思考的;逆向思维则是不依照题目内条件出现的先后顺序,而是从反方向(或从结果)出发,进行逆转推理的一种思维方法.在数学解题中,通常是从已知到结论的方式,然而有些数学题,若总是按照这种思维方式则比较困难,而且常常伴随有较大的运算量,有时甚至无法解答,在这种情况下,只要我们多注意定义、定理、公式的 Reverse thinking is in contrast to forward thinking.When analyzing and answering questions, forward thinking is based on the order in which conditions appear, while reverse thinking is not in the order of appearance of the questions, Reverse thinking (or from the result), a way of thinking of reverse reasoning.In the mathematical problem solving, usually known from the conclusion of the way, however, some math problems, if always in accordance with this way of thinking is more difficult , And often accompanied by a large amount of computation, and sometimes can not even answer, in this case, as long as we pay more attention to the definition, theorem, formula